To enter Championship Mode, wait for the Capcom logo, then press Down, R, Up, L, Y, B.
Different Clothing on the Characters
When turning on the game, wait till it says "CAPCOM" and rapidly enter the following code: Down, R, Up, L, Y, and B. The screen with the street fighter logo will now turn blue. Select any character but instead of pressing A, press Start
Check out some new sounds for SFII. You can change the sound effects in the Options Mode by pushing the R button rapidly on either 25, 26, or 27. You'll hear some new sound effects on 1f through 23.
At any character profile screen hold L + R on Controller Two. Now you can access all the profile screens without interruption.